$2^2-2\cdot2\cdot5+5^2$
$\sqrt{6a^2}\cdot\sqrt{3a^4}$
$\lim_{x\to\frac{-\pi}{4}}\frac{\left(\tan\left(x\right)+1\right)}{4x+\pi}$
$\sec^2\left(a\right)+\tan\left(a\right)+1$
$63=56\left(1+0.004\left(a-20\right)\right)$
$\frac{sin\:a\:cos\:a+sin\:b\:cos\:b}{sin\:a\:cos\:a-sin\:b\:cos\:b}$
$100a^2\:-\:140ab\:+\:49b^2$
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